Home / 31,670.13-43,712.10-20,917.14

Finding the Fourth Proportional to 31,670.13, 43,712.10 and 20,917.14

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Solution

The fourth proportional to 31,670.13, 43,712.10 and 20,917.14 is: 28,870.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,670.13 : 43,712.10 = 20,917.14 : x
  2. Step 2: Convert to fraction form
    31,670.13/43,712.10 = 20,917.14/x
  3. Step 3: Cross multiply
    31,670.13x = 43,712.10 × 20,917.14
  4. Step 4: Simplify right side
    31,670.13x = 914,332,115.39
  5. Step 5: Solve for x
    x = 914,332,115.39/31,670.13
  6. Step 6: Final answer
    x = 28,870.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.